Calling device



April l0, 1928.

1,665,622 l.. L. E. cHAuvEAu CALLING DEVICE Filed Feb. 25. 1922 Le? l .Jj n vwanboz L. L..

Patented Apr. 10, 1928.

UNITEDv STATESPATENTOFFICE.; r

LoUIs LUGIEN EUGNE CHAUVEAU, 'or PARIS, ria/irren.V

CALLING DEVICE.v

Application filed. February 23, 1922, Serial No. 538,497, and in FranceMarch r22, 1921.

AThe present invention relates to an apparatusbelonging to the categoryof selective calling devices. The particular object of the invention isto cause the actuation of a call indicating device such as a lamp, bell,etc., inlresponse to a series of signals having a predetermined durationand succeeding each other at predetermined time intervals, such as, aletter or combination of letters, or numbers, of the Morse code. .Thisapparatus is particularly applicable to receiving. stations for wirelessor wire telegraphy or telephony.

The apparatus comprises an element movable preferably at a. uniformspeed to traverse a certain course `for causing the operation of thecall.` At different points of the said course corresponding to theselected series of signals, the lmovable elementacauses the operation ofa switch which maintains a restoring magnet of the movable elementdeenergized during the time intervals corresponding to the silentperiods of the selected series of call signals. During the rest of thetime, the received signals maintain the magnet in the deenergizedcondition. If the operation caused by the movable element and the actionof the` signals received f do not correspond, i. e. if the series ofsignals received is not the one for which the apparatus isl adjusted,the movable element is restored to its normal position of waitingcondition, and the calling element is not actuated. p

The invention will be more readily understood by means of the drawing inwhich the single figure shows by way of illustration one embodiment ofthe invention.

In the drawing an electromagnet 1 of the plunger type is provided with acore -2 of soft iron suspended at the'end of a string 3. The string maybe wound ona drum 4 rotatable around a shaft A5. The drum 4 is providedwith a restoring spring 4 such as a coiled spring having one endconnected to the drum and the other to the shaft. The adjustment of thearrangement is such that when theelectromagnet 1 is not energized, itscore 2Adescends and through the agency of the string 3 causes drum 4 torotate. However, when'the electromagnet 1 is energized, 'the core 2rises, the'spring rotates the drum in the opposite direction, and thestring is woundon the drum.l It will be seen, therefore, that theweightof the core 2 @rateale-@- .the .Spring @f the drum e., but 1the-spring has suflicient 'power to lift the` string when it is notpulled by the weight of the core 2 being applied thereto.

When the drum rotates in one direction under the control of the kweightof core 2,

it moves lwith it a toothed wheel 6 throughk lthe agency of a pawl 7.The toothed wheel is mounted on a common shaft with a pinion 8. Throughthe agency of a worm on shaft 9, the pinion actuates a fan 9.

l/Vhen the core 2 rises and the `drum 4 is rotated in the otherdirection by its spring` the pawl 7 slides back overthe teeth of wheel6. The operation is the same-as in the usual ratchet and pawlarrangement. When the pawl 7 moves in one direction it can drive theratchet wheel 6, but when it moves in the opposite direction it slidesover the teeth of wheel 6 imparting no motion thereto. As a result ofthis, the regulator comprising the fan and the parts connected theretoaffects the speed of the core 2 only during the descent of the latter,the rising due to magnetization of the core being lsubstantiallyinstantaneous.

VThe c ore 2 carries a controller 10 having a certain number ofV Contactshoulders 10,

10, 10 which may be engaged by a brush 11 to close a circuit for thecontrol relay 12. These shoulders constitute the key of the apparatusand correspond to the calling signal. They are arranged in such a mannerthat, the contact 11 is closedl through a battery B during the silent orspacing periods corresponding to the calling signal sent by the callingstation. e

The sending of the signaly by the calling i station actuates the relaysignall 13 connected to the receiverwhereby, when the letter correspondsto the arrangement of the shoulders on member 10, the relays v12 and 13are successively actuated. This'is accomplished y i.

in such a manner that there is no interruption in the action of therelays 12`and 13,

the relay 12 vbeing in actuated condition when the magnet 13 is innormalcondition, and vice versa.

The relay 12 controls and the relay 13 the contact 15, V15. Thesecontacts are mounted and so connected that thecontacts 14, 14' f both ofthe relays 12 and 13 must cooperate to close ther battery circuitthrough the electromagnet 1. If both relays `12 and 13 are deenergizedthe circuit of the electromagnet 1 is closed, the normally closedcircuit being as follows; plus poleofl battery ative When the controllerand signal responsive means supplement each other.

2. In selective call receiving systems, the combination of a plungermounted to descend by gravity a certain distance during ay periodcorresponding to the call, governing means for regulating the speed ofdescent of said plunger, means for connecting said governing means tosaid plunger when said yplunger is traversing its course, resetting andmeans for governing the descent of said plunger, a normally closedcircuit including a coil cooperating with said plunger for preventingits descent, a controller corresponding to the callconnected to saidplunger, means responsive to signals, means for causing said controllerand signal respon' sive means to cooperate to maintain an open circuitWhen the cont-roller andk signal responsive means supplement each other.

4. In a calling device for operation under the action of signals formedby short and long electrical impulses, said impulses being combined inany desired manner to produce a signal, the combination of a signalrelay controlled by received impulses, a movable element havingshoulders corresponding to the signal to be selected, means governingthe movement of said element, a control rclay and means whereby thecontrol relay is operated by said shoulders, and an electroinagnet forrestoring the movable element to its initial position, said relays beingarranged to close the circuit of said electromagnet Whenever theincoming signaldoes not supplement the operations of saidl second meansby the shoulders of said movable element.

5'. In a calling device for operation under the action, of signalsformed by short and long electrical impulses, said impulses beingcombined in any desired manner to produce a signal, the combination of asignal relay controlled by received impulses, a movable element havingshoulders corresponding to the signal to be selected, means governingthe movement of said element, a control re-- lay and means wherebythefcontrol relay is operated by said shoulders, an electromagnet forrestoring the movable element to its` initial position, said relaysbeing arranged to close the circuit` of said electromagnet Whenever theincoming signal does not sups plement the operations of said secondmeans by the shoulders of said movable element, and a supplementaryrelay for insuring the positive return of the movable element to itsinitial position in case of Wrong signal independent of any signalreceived during its return.

LOUIS LUCIEN EUGNll-I CHAUVEAU.

